I'm so glad you have mentioned that. I honestly predicted that if I were to say mean, it would blow over most people's heads. Mean is a very picky term that I feel the average would not be able to pick up one (so the mean)

Regardless of the constituents, we know that the first 4 draws average to 10. Knowing that, we can replace our unknown numbers with 10 and sum them all up - the sum would be exactly the same regardless of constituents. 10*4 = 40. The 5th draw gives us the number 20, so we add that and the sum is now 60. Divide that by the amount of draws, which is now 5, and you get 12.

4 multiplied by 10 gives you 40, considering there's only 4 pieces of data, divide by 4. That leaves you with 10. Add the 20 in as a 5th piece of data and you get a total of 60 divided by 5(Each piece of data) and you end up with 12.

This is literally primary school maths; why are you acting like we should spoiler this stuff?

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Alex, the purpose is that every vote is independent. If you show your answer, the votes have dependence amongst them. Do you know the definition of what it means for each observation to be uncorrelated?

There once was a post on facebook with elementary math (the one that had the order of operations). I think as much as 1/3 to 1/2 half got it wrong.

Thank you for being a douchebag and not put spoiler tags when you clearly see that I have asked to do so.

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The logical step that people will miss is how you got 40. A few people look like they just took the average between 20 and 10 which is 15.

Tl;dr the arithmetic was designed to be easy, but it was not a test of arithmetic, it was a test of logic and problem solving.